Enabling SPI1 and SPI3 on Linux (Naon)
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Contents
Introduction[edit | edit source]
This article shows how to enable the SPI1 and SPI3 (with CS1 chip select) interfaces which can be used in a standard Linux application.
Pin Mux Option[edit | edit source]
SPI signals are available at different Naon pins. Please note that the NaonEVB-Mid carrier board provides the SPI1 and SPI3 signals at the J21 connector.
The following configuration can be used:
Option 1[edit | edit source]
| Signal | Naon Connector Phisical Pin | CPU Ball |
|---|---|---|
| SPI1_SCLK | J1.34 | AC3 |
| SPI1_SCS1n | J2.112 | W6 |
| SPI1_D0 | J1.37 | AA6 |
| SPI1_D1 | J1.90 | AA3 |
| SPI3_SCLK | J2.99 | AC26 |
| SPI3_SCS1n | J2.111 | AG27 |
| SPI3_D0 | J2.89 | V22 |
| SPI3_D1 | J2.87 | AA25 |
U-Boot patches[edit | edit source]
 The patches below applies to NELK 4.0.0 and above U-Boot source tree. |
The files arch/arm/mach-omap2/board-diva.c and arch/arm/mach-omap2/diva_pinmux_table.h must be modified according to the following patches:
U-Boot must be rebuilt to make these modifications effective.
Linux kernel patches[edit | edit source]
|
The patches below applies to NELK 4.0.0 and above Linux source tree. |
The files arch/arm/mach-omap2/board-diva.c and arch/arm/mach-omap2/diva_pinmux_table.h must be modified according to the following patches:
The kernel must be rebuilt to make these modifications effective.
Using the interfaces[edit | edit source]
Users can access the peripherals connected to the SP1 and SPI3 buses through the spidev interface. For further information, please refer to
- https://www.kernel.org/doc/Documentation/spi/spidev
- https://www.kernel.org/doc/Documentation/spi/spidev_test.c
